Direct-dyeing cotton-dyestuff.



JOSEPH TURNER AND HARRY DEAN, 0F HUDDERSFIELD, ENGLAND.

DIRECT-'DYEING OOTTON-EDYESTUFF.

No Drawing.

To all whom it may concern:

Be it known that we, JOSEPH TURNER and I'IARRY I)EAN, subjects of King George V of Great Britain. and residents of Huddersfield, in the county of York, England, have invented certain new and useful Improve ments in the Manufacture of Direct-Dyeing Cotton-Dyestuffs, of which the following is a specification.

This invention relates to the manufacture of direct dyeing cotton dyestuffs, in investigating which we have found that ortho chlor anilin or para chlor analin or a mixture in any proportions of ortho chlor anilin and para chlor anilin is eminently suitable as a starting point for the preparation of dyestufis, which dye vegetable fibers in deep black shades. If, for instance, according to our invention, amido naphthol disulfonie acid H is combined with ortho chlor diazo benzol or para chlor diazo benzol or a mixture of ortho chlor diazo benzol and para chlor diazo benzol in a solution slightly acid with mineral acid, a bluish red azo dyestuff is produced which is capable of coupling further with diazo or tetrazo bodies in alkaline solution, and in the case of the tetrazo bodies the diazo group which remains free may be combined with amins or phenols producing black dyestufi's of great value.

In the production of a direct dyeing cotton dyestuit according to our invention, we combine With one molecule of the neutral salt of amido naphthol disulfonic acid H, one molecule of ortho chlor diazo benzol or para chlor diazo benzol or of a mixture of ortho chlor diazo benzol and para chlor diazo benzol, taking care that throughout the re-action a slight excess of mineral acid remains present. When the combination is completed, the color is'madealkaline and a tetrazo solution 'from one molecule of benzidin is added, and subsequently one molecule of meta. phenylene or meta toluylene diamin added. The coloring matter thus produced dyes vegetable fibers black shades of great beauty of tone.

-As an example of the production of the direct dyeing cotton dyestufi' above set forth, we diazotize 128 parts of ortho chlor diazo benzol or para chlor diazo benzol, or a mixture thereof in any proportions, taking care that the resulting diazo solution shows a slightly acid reaction. Into the solution obtained is then slowly run an aqueous solution of the neutral salt'of 1:8 amido naph- Specification of Letters Patent.

Application .filed June 3, 1910. Serial No. 564,778

prepared from 184 Patented Mar. 21, 1911.

thol-3 :6 disulfonic acid prepared by dissolving 341 parts of the acid sodium' salt in water and adding the theoretical amount of alkali. The mixture is then stirred until the cmnbination is complete after which the solution is rendered alkaline by the addition of sodium carbonate and a tetrazo solution parts benzidin added, the whole being maintained alkaline. The intermediate product which forms quickly separates as a bluish black precipitate. A solution containing 108 parts meta phenylenediamin is then added and the mixture stirred for some hours. ter is isolated in the usual manner and dyes vegetable fibers fine deep black shades.

We thus produce a valuable coloring dyestuff for vegetable. fibers by the combination of amido naphthol disulfonic with ortho chlor diazo benzol or para chlor diazo benzol or a mixture of ortho chlor diazo benzol and para chlor diazo benzolin a solution slightly acid with mineral acid, and further coupling the azo dyestuff thus prepared with a second molecule of a 'diazo compound or one molecule of a tetrazo compound in alkaline solution and\finally adding one. molecule of a meta diamin or 'a phenol.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is 1. A dyestufi', obtained by first combining amido-naphthol-disulfonic acid H with a chlor-diazo-benzol rendered slightly acid with a -mineral acid, then coupling the azo dyestufl thus obtained with one molecule of a tetrazo compound in alkaline solution, and

finally adding one molecule of a meta-diamin, said dyestufl' being a 'bronzy-black pow-- der soluble in Water with a blue-black col oration, which changes to greenish-black on the addition of an alkali, and to violet-black on the addition of an acid, said dyestuft being soluble in concentrated sulfuric acid with a bluish-black color which on dilution yields a violet black precipitate, and said dyestufl being adapted to produce fine deep black shades of great beauty of tone when applied to vegetable fibers.

2. A dyestufi'. obtained by first combining amido-naphthol disulfouic acid H with ortho-chlor-diazo-beuzol rendered slightly then coupling the acid with a mineral acid. azo dyest-ufi thus obtained with one molecule of a tetrazo compound in alkal-tflfisolu- The coloring matacid H ill-J a fine deep black shades of great beauty of tone when applied to Vegetable fibers.

In testimony whereof we afiix our signatures in the presence of two Witnesses.

JOSEPH TURNER.

HARRY DEAN.

tion, and finallyv adding one molecule of meta-diamin, said dyestufi' being a bronzyblack powder soluble in water with .a blueblack coloration, which changes to greenishblack on the addition of an alkali, and to violet-black on the addition of an acid, said dyestufi being soluble in concentrated sulfuric acid with a bluish-black color which 011 dilution yields a violet-black precipitate, and said dyestufi being adapted to produce Witnesses:

FREDE ICK I. BRIGHT, THOMAS H. BARRON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, 11. c. 

